>Is there any documentation or specification that covers the lua virtual >machine ? I'm thinking about the luac compiled format, bytecode specs, >execution model of the machine, etc... No. Just the code. See the threads below: http://lua-users.org/lists/lua-l/2003-05/msg00024.html http://lua-users.org/lists/lua-l/2003-12/msg00292.html --lhf